package controller;

/*
 * To change this template, choose Tools | Templates and open the template in
 * the editor.
 */

import com.sun.org.apache.xerces.internal.impl.dv.util.HexBin;
import java.io.IOException;
import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import model.dao.*;
import model.pojo.*;

/**
 *
 * @author Suma
 */
@WebServlet(name = "DangNhap", urlPatterns = {"/DangNhap.do"})
public class DangNhap extends HttpServlet {

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try {
            HttpSession session = request.getSession();
            String action = request.getParameter("Action");
            if (action != null) {
                if (action.equals("Nap")) {
                    String view = "index.jsp";
                    request.setAttribute("page", "DangNhap");
                    RequestDispatcher rd = request.getRequestDispatcher(view);
                    rd.forward(request, response);
                    return;
                }
            }
            String view = "index.jsp";
            String email = "";
            String matKhau = "";
            if (request.getParameter("email") != null && request.getParameter("matKhau") != null) {
                email = request.getParameter("email");
                matKhau = request.getParameter("matKhau");
                // Mã hóa MD5 cho mật khẩu 
                MessageDigest messageDigest;
                messageDigest = MessageDigest.getInstance("MD5");
                messageDigest.reset();
                messageDigest.update(matKhau.getBytes(Charset.forName("UTF-8")));
                byte[] resultByte = messageDigest.digest();
                matKhau = new String(HexBin.encode(resultByte));
                ArrayList<KhachHang> ds = KhachHangDAO.kttaikhoan(email, matKhau);

                if (ds.isEmpty()) {
                    request.setAttribute("LoiDangNhap", "Tài khoản hoặc mật khẩu không đúng!");
                    request.setAttribute("page", "DangNhap");

                } else {
                    KhachHang kh = ds.get(0);
                    session.setAttribute("KhachHang", kh);
                    view = "TrangChu.do";
                }
            }
            RequestDispatcher rd = request.getRequestDispatcher(view);
            rd.forward(request, response);
        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(DangNhap.class.getName()).log(Level.SEVERE, null, ex);
        }


    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
